MeshCentral/crowdsec.js

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module.exports.CreateCrowdSecBouncer = function (parent, config) {
const obj = {};
// Setup constants
const { getLogger } = require('@crowdsec/express-bouncer/src/nodejs-bouncer/lib/logger');
const { configure, renderBanWall, testConnectionToCrowdSec, getRemediationForIp } = require('@crowdsec/express-bouncer/src/nodejs-bouncer');
const applyCaptcha = require('@crowdsec/express-bouncer/src/express-crowdsec-middleware/lib/captcha');
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const { BYPASS_REMEDIATION, CAPTCHA_REMEDIATION, BAN_REMEDIATION } = require('@crowdsec/express-bouncer/src/nodejs-bouncer/lib/constants'); // "bypass", "captcha", "ban";
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const svgCaptcha = require('svg-captcha');
const { renderCaptchaWall } = require('@crowdsec/express-bouncer/src/nodejs-bouncer');
// Current captcha state
const currentCaptchaIpList = {};
// Set the default values. "config" will come in with lowercase names with everything, so we need to correct some value names.
if (typeof config.useragent != 'string') { config.useragent = 'CrowdSec Express-NodeJS bouncer/v0.0.1'; }
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if (typeof config.timeout != 'number') { config.timeout = 2000; }
if ((typeof config.fallbackremediation != 'string') || (['bypass', 'captcha', 'ban'].indexOf(config.fallbackremediation) == -1)) { config.fallbackremediation = BAN_REMEDIATION; }
if (typeof config.maxremediation != 'number') { config.maxremediation = BAN_REMEDIATION; }
if (typeof config.captchagenerationcacheduration != 'number') { config.captchagenerationcacheduration = 60 * 1000; } // 60 seconds
if (typeof config.captcharesolutioncacheduration != 'number') { config.captcharesolutioncacheduration = 30 * 60 * 1000; } // 30 minutes
if (typeof config.captchatexts != 'object') { config.captchatexts = {}; } else {
if (typeof config.captchatexts.tabtitle == 'string') { config.captchatexts.tabTitle = config.captchatexts.tabtitle; delete config.captchatexts.tabtitle; } // Fix "tabTitle" capitalization
}
if (typeof config.bantexts != 'object') { config.bantexts = {}; } else {
if (typeof config.bantexts.tabtitle == 'string') { config.bantexts.tabTitle = config.bantexts.tabtitle; delete config.bantexts.tabtitle; } // Fix "tabTitle" capitalization
}
if (typeof config.colors != 'object') { config.colors = {}; } else {
var colors = {};
// All of the values in "text" and "background" sections happen to be lowercase, so, we can use the values as-is.
if (typeof config.colors.text == 'object') { colors.text = config.colors.text; }
if (typeof config.colors.background == 'object') { colors.background = config.colors.background; }
config.colors = colors;
}
if (typeof config.hidecrowdsecmentions != 'boolean') { config.hidecrowdsecmentions = false; }
if (typeof config.customcss != 'string') { delete config.customcss; }
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if (typeof config.bypass != 'boolean') { config.bypass = false; }
if (typeof config.customlogger != 'object') { delete config.customlogger; }
if (typeof config.bypassconnectiontest != 'boolean') { config.bypassconnectiontest = false; }
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// Setup the logger
var logger = config.customLogger ? config.customLogger : getLogger();
// Configure the bouncer
configure({
url: config.url,
apiKey: config.apikey,
userAgent: config.useragent,
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timeout: config.timeout,
fallbackRemediation: config.fallbackremediation,
maxRemediation: config.maxremediation,
captchaTexts: config.captchatexts,
banTexts: config.bantexts,
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colors: config.colors,
hideCrowdsecMentions: config.hidecrowdsecmentions,
customCss: config.customcss
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});
// Test connectivity
obj.testConnectivity = async function() { return (await testConnectionToCrowdSec())['success']; }
// Process a web request
obj.process = async function (domain, req, res, next) {
try {
var remediation = config.fallbackremediation;
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try { remediation = await getRemediationForIp(req.clientIp); } catch (ex) { }
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//console.log('CrowdSec', req.clientIp, remediation, req.url);
switch (remediation) {
case BAN_REMEDIATION:
const banWallTemplate = await renderBanWall();
res.status(403);
res.send(banWallTemplate);
return true;
case CAPTCHA_REMEDIATION:
if ((currentCaptchaIpList[req.clientIp] == null) || (currentCaptchaIpList[req.clientIp].resolved !== true)) {
var domainCaptchaUrl = ((domain != null) && (domain.id != '') && (domain.dns == null)) ? ('/' + domain.id + '/captcha.ashx') : '/captcha.ashx';
if (req.url != domainCaptchaUrl) { res.redirect(domainCaptchaUrl); return true; }
}
break;
}
} catch (ex) { }
return false;
}
// Process a captcha request
obj.applyCaptcha = async function (req, res, next) {
await applyCaptchaEx(req.clientIp, req, res, next, config.captchagenerationcacheduration, config.captcharesolutioncacheduration, logger);
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}
// Process a captcha request
async function applyCaptchaEx(ip, req, res, next, captchaGenerationCacheDuration, captchaResolutionCacheDuration, loggerInstance) {
logger = loggerInstance;
let error = false;
if (currentCaptchaIpList[ip] == null) {
generateCaptcha(ip, captchaGenerationCacheDuration);
} else {
if (currentCaptchaIpList[ip] && currentCaptchaIpList[ip].resolved) {
logger.debug({ type: 'CAPTCHA_ALREADY_SOLVED', ip });
next();
return;
} else {
if (req.body && req.body.crowdsec_captcha) {
if (req.body.refresh === '1') { generateCaptcha(ip, captchaGenerationCacheDuration); }
if (req.body.phrase !== '') {
if (currentCaptchaIpList[ip].text === req.body.phrase) {
currentCaptchaIpList[ip].resolved = true;
setTimeout(function() { if (currentCaptchaIpList[ip]) { delete currentCaptchaIpList[ip]; } }, captchaResolutionCacheDuration);
res.redirect(req.originalUrl);
logger.info({ type: 'CAPTCHA_RESOLUTION', ip, result: true });
return;
} else {
logger.info({ type: 'CAPTCHA_RESOLUTION', ip, result: false });
error = true;
}
}
}
}
}
const captchaWallTemplate = await renderCaptchaWall({ captchaImageTag: currentCaptchaIpList[ip].data, captchaResolutionFormUrl: '', error });
res.status(401);
res.send(captchaWallTemplate);
};
// Generate a CAPTCHA
function generateCaptcha(ip, captchaGenerationCacheDuration) {
const captcha = svgCaptcha.create();
currentCaptchaIpList[ip] = {
data: captcha.data,
text: captcha.text,
resolved: false,
};
setTimeout(() => {
if (currentCaptchaIpList[ip]) { delete currentCaptchaIpList[ip]; }
}, captchaGenerationCacheDuration);
logger.debug({ type: "GENERATE_CAPTCHA", ip });
};
return obj;
}